If you're coming in during the day, take the MetroLink to Forest Park and the hotel will pick you up from that station. It's cheap, easy, and fast.
If you're coming in later, like 10pm when I'm arriving, call the hotel (1800 325 7378). They'll arrange a Taxi for you. They have a special deal ($21) with a specific company. This is a few dollars cheaper than if you arrange it yourself.